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[Discuss-gnuradio] Questions about bbn_80211b_rx.py

From: Kexiong Zeng
Subject: [Discuss-gnuradio] Questions about bbn_80211b_rx.py
Date: Wed, 5 Dec 2012 17:16:48 -0500

Hi all,

I am implementing the BBN80211 projects now. I have the following questions:

I run my receiver (with transmitter off): ./bbn_80211b_rx.py -d 4 -f 2.437G -b -g 100 -v
The result is:

address@hidden:~/Projects/bbn_80211/branches/usrp2_version/gr-bbn/src/examples$ sudo ./bbn_80211b_rx.py -d 4 -f 2.437G -b -g 100 -v
adc frequency =  100000000
decimation frequency =  4
input_rate =  25000000
gain =  100.0
desired freq =  2437000000.0
baseband frequency 0.0
dxc frequency -37000000.0
>>> gr_fir_ccf: using SSE
Recieved (short) header!
  signal: 0x37
  service: 0xD9
  length: 0xB5D6
  crc: 0xAA78
Calculated crc: 0x1DD1
*** BAD CRC ***
Recieved header!
  signal: 0xF0
  service: 0xAF
  length: 0x7367
  crc: 0x9C3D
Calculated crc: 0xA7A4
*** BAD CRC ***
Recieved header!
  signal: 0xB4
  service: 0x4F
  length: 0xE127
  crc: 0x42E5
Calculated crc: 0x3BA3
*** BAD CRC ***
Recieved (short) header!
  signal: 0x0A
  service: 0x88
  length: 0xBF87
  crc: 0xB627
Calculated crc: 0x66E6
*** BAD CRC ***

As you can see, I always fail the CRC check and cannot decode the 80211 packets successfully.

I saw some people encountered the same problems as mine but no solutions were posted. Can anyone help?

Many thanks!
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